diff --git a/Library/Homebrew/formula_installer.rb b/Library/Homebrew/formula_installer.rb
index 30059acba0..a4f3a40673 100644
--- a/Library/Homebrew/formula_installer.rb
+++ b/Library/Homebrew/formula_installer.rb
@@ -518,6 +518,7 @@ class FormulaInstaller
       puts "The offending files are:"
       puts non_exes
       @show_summary_heading = true
+      Homebrew.failed = true # fatal to Brew Bot
     end
   end
 
@@ -532,6 +533,7 @@ class FormulaInstaller
       puts "The offending files are:"
       puts non_exes
       @show_summary_heading = true
+      Homebrew.failed = true # fatal to Brew Bot
     end
   end